Opus 5.5 uses 37% more tokens per task than Opus 5
On Artificial Analysis’s Coding Agent Index, Claude Opus 5.5 uses 15.6 million tokens per task, 37% more than the 11.4 million used by Opus 5.
Cached input rises from 10.9 million to 14.6 million tokens. Output more than doubles, from 137,000 to 333,000 tokens.